Drive device
By designing the thrust module and pressure-controlled fluid system in the drive device of the impeller rotary machinery, the problem of difficult to offset the rotor's axial force is solved, and axial force adjustment and the extension of the motor service life are achieved.
Patent Information
- Application Number
- CN202420364632.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-27
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-02-27
AI Technical Summary
In impeller rotation machinery, the axial force generated by the rotor is difficult to effectively offset, resulting in the impeller being unable to operate stably.
A driving device is designed, including a thrust module, which changes the pressure distribution of the thrust module by setting on the outer circumference of the rotor and spaced from the stator, thereby forming an axis. The force adjustment structure cancels the axial force generated by the rotor.
Effective offset or control of the axial force of the rotor is achieved, the increase of axial force deviation is avoided, the service life of the motor is extended, and the structure is simple and the modification is low.
Smart Images
Figure CN222464348U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of impeller rotating machinery, in particular to a driving device. Background Art
[0002] The motor is a conventional engineering device. However, in actual use, an unbalanced force in the axial direction is generated during the operation of the centrifugal impeller, and the motor needs to provide force to offset it. If the axial force of the motor cannot provide sufficient axial force, the impeller cannot operate stably. The axial force of the impeller is mainly caused by the pressure difference between the inlet and the back of the wheel. If a disc-shaped structure can be arranged on the motor rotor and a pressure difference is formed on both sides of the disc-shaped structure, the overall axial force can be adjusted. In the magnetic bearing motor, such a disc-shaped structure exists in the axial magnetic bearing, which is one of the necessary structures. Then, if a pressure difference can be formed on both sides of the disc-shaped structure of the axial magnetic bearing, an axial force adjustment structure can be established. Utility Model Content
[0003] Based on this, it is necessary to provide a driving device that can offset the axial force generated by the rotor, thereby eliminating the axial force of the rotor or controlling the axial force within a certain range.
[0004] A driving device, comprising:
[0005] chassis;
[0006] A motor, the motor is installed in the housing, the motor comprises a rotor and a stator; the rotor is rotatable relative to the housing; the stator is sleeved and fixed on the outer circumference of the rotor and is capable of generating a rotating magnetic field that interacts with the rotor; and
[0007] A thrust module is sleeved and fixed on the outer circumference of the rotor and is axially spaced from the stator, and divides the interior of the casing into a first accommodating chamber and a second accommodating chamber. The first accommodating chamber and the second accommodating chamber are distributed along the axial direction of the casing and are located on both sides of the thrust module. By allowing the pressure-controlled fluid to flow into or out of the first accommodating chamber, the pressure on the side of the thrust module facing the first accommodating chamber is changed, so that a pressure difference is formed between the side of the thrust module facing the first accommodating chamber and the side away from the first accommodating chamber, so that when the rotor is subjected to axial force and axial displacement occurs, the thrust module can generate a corrective force that at least partially offsets the axial force.
[0008] In one embodiment, when the direction of the axial force is the direction from the stator to the thrust module, the direction of the corrective force is the direction from the thrust module to the stator; when the direction of the axial force is the direction from the thrust module to the stator, the direction of the corrective force is the direction from the stator to the thrust module.
[0009] In one embodiment, the thrust module includes a thrust piece and a sealing piece, wherein the thrust piece is sleeved and fixed on the outer circumference of the rotor and is axially spaced apart from the stator, and the sealing piece is sealingly arranged between the outer wall of the thrust piece and the inner wall of the casing, and the sealing piece, the thrust piece and the first end of the casing together enclose a first accommodating cavity, and the sealing piece, the thrust piece and the second end of the casing together enclose a second accommodating cavity.
[0010] In one embodiment, the seal is an annular structure, the outer wall of the seal is seamlessly fixed to the inner wall of the casing, there is a gap between the inner wall of the seal and the outer wall of the thrust piece, and sealing teeth are provided between the inner wall of the seal and the outer wall of the thrust piece.
[0011] In one of the embodiments, a pressure control port is disposed on the side wall of the housing, and the pressure control port is communicated with the first accommodating cavity.
[0012] In one embodiment, there are multiple pressure control ports, and the multiple pressure control ports are arranged at intervals on the side wall of the casing.
[0013] In one embodiment, the plurality of pressure control ports include a first pressure control port and a second pressure control port, and the pressure control fluid can enter the first accommodating chamber through the first pressure control port and then move out of the first accommodating chamber through the second pressure control port, so as to change the pressure on the thrust module facing the first accommodating chamber side while achieving cooling of the motor.
[0014] In one embodiment, the driving device also includes an impeller, one end of the rotor extends out of the casing, the impeller is connected to the end of the rotor extending out of the casing, the first accommodating chamber is located on a side of the thrust module away from the impeller, and the second accommodating chamber is located on a side of the thrust module close to the impeller.
[0015] In one of the embodiments, the driving device further includes a fastener, which passes through the impeller and cooperates with an end of the rotor extending out of the casing to fixedly connect the impeller and the rotor.
[0016] In one embodiment, the casing is a hollow structure with one end open, the first end of the casing is a closed end, and the second end of the casing is an open end, the driving device also includes a wheel back plate, and the wheel back plate is arranged at the open end of the casing, the sealing member, the thrust member, the wheel back plate and the second end of the casing together enclose the second accommodating chamber, one end of the rotor passes through the wheel back plate and extends out of the casing, and the impeller is located on the side of the wheel back plate away from the second accommodating chamber and is connected to one end of the rotor.
[0017] The drive device provided by the present application is provided with a thrust module on the outer periphery of the rotor, and the thrust module divides the interior of the casing into a first accommodating chamber and a second accommodating chamber located on both sides of the thrust module. The pressure on the side of the thrust module facing the first accommodating chamber is changed by allowing the pressure-controlled fluid to flow into or out of the first accommodating chamber, so that a pressure difference is formed between the side of the thrust module facing the first accommodating chamber and the side away from the first accommodating chamber (i.e., the side facing the second accommodating chamber), so that when the rotor is axially offset by the axial force, the thrust module can generate a corrective force that at least partially offsets the axial force, thereby offsetting the axial force deviation generated by the rotor, avoiding the increase of the axial force of the rotor, and achieving the elimination of the axial force of the rotor or controlling the axial force within a certain range, thereby extending the service life of the motor; in addition, the drive device of the present application has a simple structure, and only needs to add a thrust module on the basis of the original drive device for simple modification, with low modification cost, and efficient and fast response of the axial force control of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A cross-sectional view of a driving device provided in an embodiment of the utility model. DETAILED DESCRIPTION
[0019] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
[0022] like Figure 1As shown, the present application provides a driving device 10, which includes a housing 100, a motor 200 and a thrust module 300. The motor 200 is installed in the housing 100, and the motor 200 includes a rotor 210 and a stator 220; the rotor 210 can rotate relative to the housing 100; the stator 220 is sleeved and fixed on the outer periphery of the rotor 210, and can generate a rotating magnetic field that interacts with the rotor 210; the thrust module 300 is sleeved and fixed on the outer periphery of the rotor 210, and is spaced apart from the stator 220 along the axial direction, and divides the interior of the housing 100 into a first accommodating area and a second accommodating area. The first accommodating chamber 110 and the second accommodating chamber 120 are distributed along the axial direction of the casing 100 and are located on both sides of the thrust module 300. The pressure on the side of the thrust module 300 facing the first accommodating chamber 110 is changed by allowing the pressure-controlled fluid to flow into or out of the first accommodating chamber 110, so that a pressure difference is formed between the side of the thrust module 300 facing the first accommodating chamber 110 and the side away from the first accommodating chamber 110, so that when the rotor 210 is subjected to an axial force and axial displacement occurs, the thrust module 300 can generate a corrective force that at least partially offsets the axial force.
[0023] The drive device 10 provided in the present application has a thrust module 300 disposed on the outer periphery of the rotor 210. The thrust module 300 divides the interior of the housing 100 into a first accommodating chamber 110 and a second accommodating chamber 120 located on both sides of the thrust module 300. By allowing the pressure-controlled fluid to flow into or out of the first accommodating chamber 110, the pressure on the side of the thrust module 300 facing the first accommodating chamber 110 is changed, so that a pressure difference is formed between the side of the thrust module 300 facing the first accommodating chamber 110 and the side away from the first accommodating chamber 110 (i.e., the side facing the second accommodating chamber 120), so as to When the rotor 210 is subjected to an axial force and axially deflects, the thrust module 300 can generate a corrective force that at least partially offsets the axial force, thereby offsetting the axial force deviation generated by the rotor 210, avoiding an increase in the axial force of the rotor 210, and achieving the elimination of the axial force of the rotor 210 or controlling the axial force within a certain range, thereby extending the service life of the motor 200; in addition, the drive device 10 of the present application has a simple structure, and only requires a simple modification by adding a thrust module 300 to the original drive device, with low modification cost, and efficient and fast response of the axial force control of the rotor 210.
[0024] When the direction of the axial force is the direction from the stator 220 to the thrust module 300, the direction of the corrective force is the direction from the thrust module 300 to the stator 220; conversely, when the direction of the axial force is the direction from the thrust module 300 to the stator 220, the direction of the corrective force is the direction from the stator 220 to the thrust module 300. In this way, the axial force deviation generated by the rotor 210 can be offset, the increase of the axial force of the rotor 210 can be avoided, and the axial force of the rotor 210 can be eliminated or controlled within a certain range, thereby extending the service life of the motor 200.
[0025] Specifically, the accommodating space of the first accommodating chamber 110 is larger than the accommodating space of the second accommodating chamber 120. The first accommodating chamber 110 is arranged near the first end 130 of the casing 100, and the second accommodating chamber 120 is arranged near the second end 140 of the casing 100. The rotor 210 extends along the axial direction of the casing 100, that is, the extension direction of the axis of the rotor 210 is consistent with the axial direction of the casing 100. The rotor 210 is penetrated by the second accommodating chamber 120, part of which is accommodated in the first accommodating chamber 110, and part of which is located outside the casing 100. The stator 220 is fixedly installed in the casing 100, and the stator 220 is fixedly installed in the first accommodating chamber 110. The rotor 210 is rotatably penetrated by the stator 220. The rotor 210 is magnetic, and the stator 220 can generate a rotating magnetic field that drives the rotor 210 to rotate, so that the stator 220 can drive the rotor 210 to rotate.
[0026] like Figure 1 As shown, the thrust module 300 includes a thrust member 310 and a sealing member 320. The thrust member 310 is sleeved and fixed on the outer periphery of the rotor 210 and is axially spaced apart from the stator 220. The sealing member 320 is sealingly arranged between the outer wall of the thrust member 310 and the inner wall of the casing 100. The sealing member 320, the thrust member 310 and the first end 130 of the casing 100 together enclose a first accommodating chamber 110. The sealing member 320, the thrust member 310 and the second end 140 of the casing 100 together enclose a second accommodating chamber 120.
[0027] Specifically, the seal 320 is an annular structure, and the outer wall of the seal 320 is seamlessly fixed to the inner wall of the casing 100, so that the pressure-controlled fluid (such as air) cannot flow between the first accommodating chamber 110 and the second accommodating chamber 120 through the position where the seal 320 is connected to the casing 100, thereby changing the pressure difference formed between the first accommodating chamber 110 and the second accommodating chamber 120. There is a gap between the inner wall of the seal 320 and the outer wall of the thrust member 310, and the size of the gap is determined according to the rotation speed of the rotor 210, the pressure and temperature on both sides of the thrust module 300, etc., and sealing teeth 330 are arranged between the inner wall of the seal 320 and the outer wall of the thrust member 310. Specifically, at least one of the seal 320 and the thrust member 310 is provided with sealing teeth 330.
[0028] like Figure 1 As shown, a pressure control port 150 is provided on the side wall of the housing 100, and the pressure control port 150 is communicated with the first accommodating chamber 110. The pressure control port 150 is used to allow a pressure control fluid to flow into or out of the first accommodating chamber 110, so as to change the pressure on the side of the thrust module 300 facing the first accommodating chamber 110, so as to form a pressure difference between the side of the thrust module 300 facing the first accommodating chamber 110 and the side away from the first accommodating chamber 110.
[0029] Specifically, the pressure control port 150 is used to connect an external device, which may be a pressure control fluid filling device or a fan. When the external device is a pressure control fluid filling device, the pressure control fluid filling device may inject a pressure control fluid having a lower pressure than the side of the thrust module 300 away from the first accommodating chamber 110 into the first accommodating chamber 110 through the pressure control port 150, so as to form a pressure difference between the side of the thrust module 300 facing the first accommodating chamber 110 and the side away from the first accommodating chamber 110 (i.e., the side facing the second accommodating chamber 120), so that the thrust module 300, under the action of the pressure difference, can generate a corrective force that at least partially offsets the axial force. It is understandable that when the direction of the axial force of the rotor 210 changes, a pressure-controlled fluid with a higher pressure than the pressure on the side of the thrust module 300 away from the first accommodating chamber 110 can be injected into the first accommodating chamber 110 through the pressure-controlled port 150, so that the thrust module 300 can generate a corrective force that at least partially offsets the axial force under the action of the pressure difference.
[0030] When the external device is a fan, the fan can extract the pressure-controlled gas in the first accommodating chamber 110 through the pressure-controlled port 150 to reduce the pressure on the side of the thrust module 300 facing the first accommodating chamber 110, so that a pressure difference is formed between the side of the thrust module 300 facing the first accommodating chamber 110 and the side away from the first accommodating chamber 110, so that the thrust module 300 can generate a corrective force that at least partially offsets the axial force under the action of the pressure difference.
[0031] like Figure 1 As shown, there are multiple pressure control ports 150, and the multiple pressure control ports 150 are arranged at intervals on the side wall of the housing 100. Preferably, the multiple pressure control ports 150 include a first pressure control port 151 and a second pressure control port 152, and the pressure control fluid (for example, pressure control air) can enter the first accommodating chamber 110 through the first pressure control port 151, and then move out of the first accommodating chamber 110 through the second pressure control port 152, so as to change the pressure on the side of the thrust module 300 facing the first accommodating chamber 110 and realize cooling of the motor 200.
[0032] Specifically in the present embodiment, the first pressure control port 151 is arranged closer to the second end 140 of the casing 100 than the second pressure control port 152. The number of the first pressure control port 151 and the second pressure control port 152 are both 2. The two first pressure control ports 151 are arranged at intervals on opposite sides of the casing 100, and the two second pressure control ports 152 are arranged at intervals on opposite sides of the casing 100. The heights of the two first pressure control ports 151 are flush with each other, and the heights of the two second pressure control ports 152 are flush with each other. The pressure-controlled fluid can enter the first accommodating chamber 110 through the two first pressure control ports 151, and then move out of the first accommodating chamber 110 through the two second pressure control ports 152.
[0033] like Figure 1 As shown, the driving device 10 further includes an impeller 400, one end of the rotor 210 extends out of the housing 100, and the impeller 400 is connected to the end of the rotor 210 extending out of the housing 100, the first accommodation chamber 110 is located on a side of the thrust module 300 away from the impeller 400, and the second accommodation chamber 120 is located on a side of the thrust module 300 close to the impeller 400. Specifically, the stator 220 can drive the rotor 210 to rotate, thereby driving the impeller 400 to rotate through the rotor 210.
[0034] The driving device 10 further includes a fastener 500 , which may be, but is not limited to, a threaded fastener. The fastener 500 passes through the impeller 400 and cooperates with an end of the rotor 210 extending out of the casing 100 to fix the impeller 400 and the rotor 210 together.
[0035] like Figure 1 As shown, further, the casing 100 is a hollow structure with one end open, the first end 130 of the casing 100 is a closed end, and the second end 140 of the casing 100 is an open end. The driving device 10 also includes a wheel back plate 600, which is arranged at the open end of the casing 100. The sealing member 320, the thrust member 310, the wheel back plate 600 and the second end 140 of the casing 100 are jointly enclosed to form a second accommodating chamber 120. One end of the rotor 210 passes through the wheel back plate 600 and extends out of the casing 100. The impeller 400 is located on the side of the wheel back plate 600 away from the second accommodating chamber 120 and is connected to one end of the rotor 210.
[0036] Furthermore, a sealing structure 700 is provided between the wheel back disc 600 and the rotor 210 to improve the sealing performance between the wheel back disc 600 and the rotor 210. The sealing structure 700 may be, but is not limited to, a sealing tooth, and at least one of the wheel back disc 600 and the rotor 210 is provided with the sealing structure 700.
[0037] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0038] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A driving device, characterized in that: include: chassis; A motor, the motor is installed in the housing, the motor comprises a rotor and a stator; the rotor is rotatable relative to the housing; the stator is sleeved and fixed on the outer circumference of the rotor and is capable of generating a rotating magnetic field that interacts with the rotor; as well as A thrust module is sleeved and fixed on the outer circumference of the rotor and is axially spaced from the stator, and divides the interior of the casing into a first accommodating chamber and a second accommodating chamber. The first accommodating chamber and the second accommodating chamber are distributed along the axial direction of the casing and are located on both sides of the thrust module. By allowing the pressure-controlled fluid to flow into or out of the first accommodating chamber, the pressure on the side of the thrust module facing the first accommodating chamber is changed, so that a pressure difference is formed between the side of the thrust module facing the first accommodating chamber and the side away from the first accommodating chamber, so that when the rotor is subjected to axial force and axial displacement occurs, the thrust module can generate a corrective force that at least partially offsets the axial force.
2. The driving device according to claim 1, characterized in that: When the direction of the axial force is the direction from the stator to the thrust module, the direction of the corrective force is the direction from the thrust module to the stator; when the direction of the axial force is the direction from the thrust module to the stator, the direction of the corrective force is the direction from the stator to the thrust module.
3. The driving device according to claim 1, characterized in that: The thrust module includes a thrust piece and a sealing piece. The thrust piece is sleeved and fixed on the outer periphery of the rotor and is axially spaced apart from the stator. The sealing piece is sealingly arranged between the outer wall of the thrust piece and the inner wall of the casing. The sealing piece, the thrust piece and the first end of the casing together enclose a first accommodating cavity. The sealing piece, the thrust piece and the second end of the casing together enclose a second accommodating cavity.
4. The driving device according to claim 3, characterized in that: The seal is an annular structure, the outer wall of the seal is seamlessly fixed to the inner wall of the housing, a gap exists between the inner wall of the seal and the outer wall of the thrust piece, and sealing teeth are arranged between the inner wall of the seal and the outer wall of the thrust piece.
5. The driving device according to claim 1, characterized in that: The side wall of the housing is provided with a pressure control port, and the pressure control port is communicated with the first accommodating cavity.
6. The driving device according to claim 5, characterized in that: There are multiple pressure control ports, and the multiple pressure control ports are arranged at intervals on the side wall of the casing.
7. The driving device according to claim 6, characterized in that: The multiple pressure control ports include a first pressure control port and a second pressure control port. The pressure control fluid can enter the first accommodating chamber through the first pressure control port and then move out of the first accommodating chamber through the second pressure control port, so as to change the pressure on the thrust module toward the first accommodating chamber side and realize cooling of the motor at the same time.
8. The driving device according to claim 3, characterized in that: The driving device also includes an impeller, one end of the rotor extends out of the casing, and the impeller is connected to the end of the rotor extending out of the casing. The first accommodating chamber is located on a side of the thrust module away from the impeller, and the second accommodating chamber is located on a side of the thrust module close to the impeller.
9. The driving device according to claim 8, characterized in that: The driving device further comprises a fastener, which passes through the impeller and cooperates with an end of the rotor extending out of the casing to fixedly connect the impeller and the rotor.
10. The driving device according to claim 8, characterized in that: The casing is a hollow structure with one end open, the first end of the casing is a closed end, and the second end of the casing is an open end. The driving device also includes a wheel back plate, which is arranged at the open end of the casing. The sealing member, the thrust member, the wheel back plate and the second end of the casing together enclose the second accommodating chamber, one end of the rotor passes through the wheel back plate and extends out of the casing, and the impeller is located on the side of the wheel back plate away from the second accommodating chamber and is connected to one end of the rotor.